Public STUN servers
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provserver.televolution.net
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sip1.lakedestiny.cordiaip.com
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stun1.voiceeclipse.net
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stun01.sipphone.com
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stun.callwithus.com
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stun.counterpath.net
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stun.ekiga.net (alias for stun01.sipphone.com)
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stun.ideasip.com (no XOR_MAPPED_ADDRESS support)
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stun.internetcalls.com
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stun.ipns.com
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stun.noc.ams-ix.net
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stun.phonepower.com
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stun.phoneserve.com
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stun.rnktel.com
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stun.softjoys.com (no DNS SRV record) (no XOR_MAPPED_ADDRESS support)
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stunserver.org see their usage policy
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stun.sipgate.net
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stun.sipgate.net:10000
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stun.voip.aebc.com
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stun.voipbuster.com (no DNS SRV record) (no XOR_MAPPED_ADDRESS support)
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stun.voxalot.com
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stun.voxgratia.org (no DNS SRV record) (no XOR_MAPPED_ADDRESS support)
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stun.xten.com
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numb.viagenie.ca (http://numb.viagenie.ca) (XOR_MAPPED_ADDRESS only with rfc3489bis magic number in transaction ID)
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stun.ipshka.com inside UA-IX zone russsian explanation at http://www.ipshka.com/main/help/hlp_stun.php